Wire line sling and fitting therefor



Sept. 13, 1938. R. w. SILER WIRE LINE SLING AND FITTING THEREFOR Filed Dec.

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arsenic wins Lina same Arno rrr'rme 'rnnasroa Robert W. Siler, lliong Beach, Calif., assignor to Macwhyte Company, Kenoslia, Wia, a corporation of ois Application December 31, 1935, Serial No. 56,960

6 Claims.

The primary object of my invention is to provide a double or multiple sling for use in lifting and suspending long or awkward shaped objects at a plurality of points.

A corollary object of the invention is to provide .a self-clamping block in which both free ends of a wire line sling may be firmly placed without damage to the line and from which they may be instantly removed.

A corollary object of my invention is to provide a block in which the free ends of the line may be clamped and having an upward looking hook over which the bight of the line may be looped in making a double sling.

A corollary object of my invention is to provide a hook or other grapple having a downward looking projection to engage a loop in the line and a guide through which the loop may be passed.

The objects and advantages of the invention 2o may best be seen on inspection of the attached drawing and the following description thereof, in

which Fig. 1 is a plane section and partial internal elevation of the clamping block A of Fig. 7, taken 25 on the line l--l of Fig. 4;

Fig. 2 is a section through clamping block A taken on the line 22 of Fig. 1;

Fig. 3 is a section through clamping block it taken on the line 3-3 of Fig. 1;

Fig. 4 on a plan section through the clamping block taken on the line ll of Fig. 1;

Fig. 5 is a side elevation of the grapple B Fig. 7;

Fig. 6 is a face elevation of the grapple; Fig. '7 is a diagram illustrating a specific manner of rigging a block with two grapples for lifting a long object, and I Fig. 8 is a plan view of the top of the grapple. Referring to Figs. 1 to 4 inclusive, It is a wire 9 line having two free ends of which one is shown at Eta. in Fig. 1. ll is a cast steel block having one edge grooved as at 2 for the reception of an eye-bolt l3 and a swiveled hook it which are retained by pins l and It respectively.

gg The opposite side of the block is provided with a rectangular socket which converges downwardly as shown in Figs. 1 and 4, the faces ill and is being parallel while faces is and 20 are drawn toward each other. Within this converging socket 550 I place two slips 2! and 22 and a spacer 23. The opposed faces of the slips and the spacer are grooved as at 24 in Figs. 2 and 4 for the reception of the wire line; these grooves should be less than a semicircle in order that the line may be placed 55 in compression by downward movement of the slips and spacer in the socket. It is desirable that the lower end of the spacer should project below the bottom of the block, as at 25, to permit its loosening by a hammer blow when the line is not in tension, and the upper end of the spacer should be curved as at 26 to prevent kinking the line.

When the free ends of the line are passed upwardly in loops through the socket and the spacer and slips then inserted, a downward pull on the line' will draw the assembly firmly into place in the socket and cause the spacer and slips to grip the line very firmly, without cutting or damaging it in any way, the curvature of the spacer and slips making it unnecessary to provide the grooves with gripping teeth. This ability to hold the line firmly without crushing or cutting it permits the use of a single line for slings of various lengths, as any desired portion of the total length of the line may be left in the free ends Ma.

The use of two slips as shown and described above is desirable as affording freedom of downward movements of the line on the right side of the spacer. It is, however, entirely within the spirit of the invention to omit the straight or right-hand slip 2| and to form the rope grooves in the end face of the socket itself, taking care that these grooves are smoothso as not to chafe the line as it pulls down over the curved spacer end 26.

Referring now to Figs. 5,- 6, and 8, the grapple (which is shown in these figures as a hook) has a fiat shank 38 with a right angled projection 34, this projection being formed with a slot 32 through which a loop of the line may be passed. Below this slot a hook or stud 33 is placed, this element having its lower face curved in both directions, as at 34 in Figs. 5 and 6, to receive the line and to permit the loop to run over it without kinking. The shank may terminate in a hook 35 or any other form of grapple which may be convenient for the work to be done.

A loop of the line H] is passed downwardly through slot 32 and placed over stud 33, around which the line will slip to permit the grapple to assume a position at the end of the loop when a pull is taken on it. A grapple of different form may be substituted at will by unhooking and withdrawing the loop.

Fig. 7 illustrates a manner in which a double sling may be formed with the fittings described. The two free ends Illa of the line are clamped in block A, the eye-bolt I3 being supported by a cargo hook, if a vessel is being loaded. or by a hitch in the end of a cat-line for use in an oil well derrick. The bight of the line is then placed over hook I 4 and the line drawn down, forming two loops which are inserted in the slots in grapples 3-13 and placed over the studs in each grapple. The grapples being then attached to a weight to be lifted, the line will run over hook l4 and studs 33 until the loops are equalized before the load leaves the ground.

I have shown the eye-bolt i3 and the hook it of the block A as being swivelled, but they may be made rigid if preferred. Hook l4 may desirably be formed with a double curvature as shown at.33 and 34 to facilitate the running of the line through the block without damage.

It will also be noted that while I have shown the block A as provided with grooves for the two ends of a single line, the arrangement of parts shown in Figs. 1 to 4 is applicable also to a block with a single groove or any greaternumber of grooves, for the attachment of a corresponding number of wire lines.

I claim as my invention:

1. A double sling comprising: a wire line having two free ends; a lifting block in which said free ends are removably clamped; a hook afilxed to the body of said block and supporting the bight of the line at a point intermediate its ends, and a plurality of freely removable grapples roven in said line and movable thereon between said hook and the clamped ends of said line.

2. A double sling comprising: a lifting block including a body member having a vertical taperlug socket formed therein, said socket having two,

opposed walls upwardly diverging; a wedge assembly adapted to seat in said socket, said assembly comprising two mating slips having their mating faces curved to prevent relative longitudinal movement, the mating faces of both said slips and the outer face of one of said slips being grapples roven on said line and movable thereon between said hook and said locked ends.

3. A wire line sling fitting comprising: a body member having a vertical tapering socket formed therein, said socketv having two opposed walls upwardly diverging; a wedge assembly adapted to seat in'said socket, said assembly comprising two mating slips having their mating faces curved to prevent relative longitudinal movement, the

mating face of at least one of said slips and the outer face of one of said slips being longitudinally grooved to receive a wire line.

i. A device substantially as and for the purpose set forth in claim 3, in which the upper end of the one of said slips having grooves on its outer face is formed to an arcuate curvature and said grooves are continued around said curvature.

5. A device substantially as and for the purpose set forth in claim 3, including means arranged adjacent the wider end of said socket for attaching a lifting cable to said'body member, and an upwardly looking hook affixed to said body member.

6. A device substantially as and for the purpose set forth inclaim 3, in which said longitudinal grooves are pluralized on each of said grooved faces.

ROBERT W. SILER. 

